Table 2: Chemical composition of starting materials.

Main Oxides SiO2 Al2O3 Fe2O3 CaO Na2O K2O TiO2 MnO MgO SO3 BaO L.O.I
MK 46.68 35.75 1.49 0.10 0.05 2.96 0.07 0.01 0.19 0.03 0.02 12.18
GBFS 26.15 7.43 1.31 44.38 0.75 0.53 0.68 5.25 5.52 2.90 4.72 ---